COMPATIBILITY: This wireless remote speed controller is designed to work with ECMF series fans manufactured in November 2019 or later. Your fan must have 3.5mm TRRS connection port to be compatible with this wireless controller. 50 FT RANGE:This wireless remote speed controller have a strong signal that works through ceilings and walls and reaches your fan from up to 50 ft away. 6 SPEED LEVELS:The controller is programmed with 6 pre-set speed settings. OFFÂ= 0% Output /  Level 1Â= 15% Output / Level 2 = 32% Output / Level 3 = 50% Output / Level 4 = 67% Output / Level 5 = 83% Output / Level 6 = 100% Output STORES PREFERENCES: Your last selected speed level will be stored in fan’s memory even when the fan is powered off. The fan will automatically start at your previously selected speed level once the power is restored. MULTIPLE FAN CONFIGURATIONS: When using multiple fans with multiple wireless remote speed controls, you have an option of either pairing your fans to the same remote for synchronous operation or pairing your fans to separate remote controls to operate each fan individually. Package includes:1. 1x Wireless remote speed controller 2. 1x Wireless remote speed controller receiver antenna 3. 2x CR2023 batteries (1 inside remote +1 spare) 4. 3.5mm TRRS cable for receiver antenna connection 5. Screw and anchor set